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Illinois State Boundary
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- Illinois State Geological Survey
- Publication Date
- 1984, 199803, 200306
- Title
- Illinois State Boundary
- Edition
- 2.0
- Geospatial Data Presentation Form
- vector digital data
- Series Information
- Series Name
- ISGS GIS Database
- Issue Identification
- GISDB.IL_BNDY_State_and_County_Boundaries
- Publication Information
- Publication Place
- Champaign, Illinois
- Publisher
- Illinois State Geological Survey
- Online Linkage
- http://www.isgs.illinois.edu/
- Online Linkage
- http://illinois.edu
- Abstract
- This data set contains the Illinois state boundary in line and polygon format. There are two versions of the data included: one that includes the official state boundary portion that extends into Lake Michigan, and one that depicts the state boundary in that area as the Lake Michigan shore line. There are no user-defined attributes. The nominal scale is 1:62,500. As of 2003, the data are typically distributed in geographic coordinates (longitude and latitude), decimal degrees, and the North American Datum (NAD) of 1983, and this is the default spatial reference of the ArcSDE feature dataset in which the data are stored. The data were originally developed, however, in a custom Lambert Conformal Conic projection and were distributed in that coordinate system for several years. The data were digitized in the late 1960s and in 1984-85 from 7.5- and 15-minute USGS topographic quadrangles. Errors in the location of a given feature are dependent on the accuracy of the original maps and on the accuracy of digitizing. Estimates are that features have an average locational error of at least plus/minus 100 feet.
- Purpose
- These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was originally created for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.
- Temporal Extent
- Currentness Reference
- Dates of source maps.
- Time Period
- Beginning
- circa 1921
- End
- 1979
- Bounding Box
- West
- -91.4244
- East
- -87.3840
- North
- 42.4951
- South
- 36.9540
- Theme Keyword
- state outline
- state boundary
- illimap
- base map
- Theme Keyword Thesaurus
- none
- Place Keyword
- Illinois
- Place Keyword Thesaurus
- none
- Access Restrictions
- ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current. Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.
- Use Restrictions
- ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section. Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage. Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section. Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data. Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. The data do not replace the need for detailed site-specific studies.
- Status
- Complete
- Maintenance and Update Frequency
- None planned
- Point of Contact
- Native Data Set Environment
- ArcSDE 9.1 on Oracle 10g
- Cross-Reference
- Title
- ISGS Terms of Use
- Online Linkage
- http://www.isgs.illinois.edu
- Cross-Reference
- Title
- University of Illinois Web Privacy Notice
- Online Linkage
- http://www.vpaa.uillinois.edu/policies/web_privacy.cfm
- Cross-Reference
- Title
- University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
- Online Linkage
- http://www.uillinois.edu/trustees/rules.cfm#sec34
- Cross-Reference
- Title
- Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
- Online Linkage
- http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html
- Data Quality Information
- Attribute Accuracy Report
- The attributes of the ArcInfo coverage from which these data were derived were reviewed in 1990 using a variety of visual techniques (polygon shading, line shading and line thicknesses tied to attribute values) and GIS processing techniques (checking for logical consistency). Arc attribute values for the items STATELINE and COUNTLINE were verified by generating plots with arcs color-coded by designation. These were visually checked for errors. Polygon attribute values were verified in a similar manner. There is no quantitative assessment of attribute accuracy available, however, this coverage has been used extensively by ISGS and DNR personnel since 1984, and it can be assumed most attribute errors have been detected and corrected. There are no know arc or polygon attribute values outside the appropriate value domains.
- Logical Consistency Report
- For a description of the logical consistency analysis performed on the original ILLIMAP data in the late 1960s and early 1970s, see the section entitled Accurracy of ILLIMAP on pages 12-15 of ISGS Circular 451. A logical consistency review was performed in March, 1998. At that time the data were maintained in ArcInfo coverage format. The following checks were made: The data set was DESCRIBED and coverage files listed to determine the feature types present. In this data set, the following feature types were found and checked: polygons, arcs, labels, nodes, and annotation. The presence of spatial indices was also checked. For PAT and AAT files, each item was checked for the following: domain of allowable values, adherence of values to the domain, definition of attribute items, requirement of all unique values for an item, logic of items redefined over other items, and length of item name as regards conversion to shapefile format. The topology status of the data set was checked, as were LABELERRORS, NODEERRORS (if appropriate), and the PROJECTION definition. The presence of a BND file was verified. The presence and location of TICS were checked. Polygon and chain-node topology present. There are no dangling arcs. There is one polygon label per polygon, except for universe polygon. Boundary values appropriate for map projection and map units. "Fuzzy" tolerance is suitable for nominal scale. Several unneeded .AAT and .PAT items were dropped, tics were replaced, three dangling arcs were corrected, and COVER-ID values were recalculated to be unique. See process steps for March, 1998. There are no attribute values outside the appropriate domains.
- Completeness Report
- In 1995, the state boundary along the Ohio River was officially changed, but these changes have not been incorporated. Also, feature class may include the portion of the state boundary that extends into Lake Michigan, or the lake shore may be depicted as the state boundary, depending on which feature class you are viewing. Some data were digitized from USGS 7.5-minute topographic quadrangles, and some from 15-minute quadrangles. As a result, scale varies within the coverage.
- Horizontal Positional Accuracy Report
- The data were initially digitized in the late 1960s and early 1970s from 7.5- and 15-minute USGS topographic maps, and that work comprises approximately two-thirds of the present data set. The accuracy was stated as follows: "For the townships digitized from 7.5-minute quadrangles, 95.2 percent of the ILLIMAP distances are within 100 feet of the recorded plat distances, and all are within 180 feet. In townships digitized from 15-minute quadrangles, 82.5 percent of the ILLIMAP distances are within 100 feet of the plat distances, and 98.7 percent are within 200 feet." For more information on the original accuracy of the data set, see ISGS Circular 451 (ILLIMAP - A Computer-Based Mapping System for Illinois, Swann, DuMontelle, Mast Van Dyke, 1970). In 1985 the data were converted to an Arc/Info coverage. The conversion was accomplished by Environmental Systems Research Institute (ESRI) of Redlands, California, working under contract with the ISGS via the Illinois Department of Energy and Natural Resources and its Lands Unsuitable for Mining Program. The remaining one third of the state was digitized from 7.5-minute quadrangles at this time (1984-85.) Details of the digitizing process are unavailable. It is reasonable to assume the positional accuracy was improved for newly digitized areas. However, it is also likely there was some degradation to the positional accuracy of the previously existing data due to automated coverage processing, for example, the use of the ArcEdit CLEAN command. Subsequently, the horizontal positional accuracy was spot verified by manual overlay of source and hard-copy plots. Arcs within line-width of source maps were deemed acceptable. The size of the sample set is unknown. Errors in the location of a given feature are dependent on the accuracy of the original maps and on the accuracy of digitizing. Current estimates are that features in the data set have an average locational error of at least plus/minus 100 feet. The source maps are subject to USGS mapping accuracy standards.
- Lineage
- Source
- Originator
- United States Geological Survey
- Publication Date
- varies from circa 1921 to 1979
- Title
- USGS 7.5- and 15-minute topographic quadrangles
- Geospatial Data Presentation Form
- map
- Series Information
- Series Name
- Topographic quadrangles
- Issue Identification
- various
- Source Scale Denominator
- 24000 and 62500
- Type of Source Media
- paper
- Source Temporal Extent
- Time Period Information
- Range of Dates/Times
- Beginning Date
- circa 1921
- Ending Date
- 1979
- Source Currentness Reference
- publication date
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Vector
- Point and Vector Object Information
- SDTS Terms Description
- SDTS Point and Vector Object Type
- String
- Point and Vector Object Count
- 35
- SDTS Terms Description
- SDTS Point and Vector Object Type
- G-polygon
- Point and Vector Object Count
- 1
- SDTS Terms Description
- SDTS Point and Vector Object Type
- String
- Point and Vector Object Count
- 5
- SDTS Terms Description
- SDTS Point and Vector Object Type
- G-polygon
- Point and Vector Object Count
- 1
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Geographic
- Latitude Resolution
- 0.000001
- Longitude Resolution
- 0.000001
- Geographic Coordinate Units
- Decimal degrees
- Geodetic Model
- Horizontal Datum Name
- North American Datum of 1983
- Ellipsoid Name
- Geodetic Reference System 80
- Semi-major Axis
- 6378137.000000
- Denominator of Flattening Ratio
- 298.257222
- Vertical Coordinate System Definition
- Altitude System Definition
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- IL_BNDY_State_Ln
- Entity Type
- Entity Type Label
- GISDB.IL_BNDY_State_Py
- Entity Type
- Entity Type Label
- GISDB.IL_BNDY_State_with_Lake_Ln
- Entity Type
- Entity Type Label
- GISDB.IL_BNDY_State_with_Lake_Py
- Entity and Attribute Overview
- There are no user-defined attributes. There is a field called ID that contains no information. It was added because ArcGIS software requires a feature class to have at least one field in addition to the OID(FID) and shape fields.
- Distribution Information
- Distributor
- Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
- Name
- Name
- Metadata Reference Information
- Metadata Date
- 20090224
- Metadata Contact
- Contact Information
- Contact Organization Primary
- Contact Instructions
- Please refer to the Distribution Information section.
- Metadata Standard Name
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata Standard Version
- FGDC-STD-001-1998
- Metadata Extensions
- Online Linkage
- http://www.esri.com/metadata/esriprof80.html
- Profile Name
- ESRI Metadata Profile